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From that same link:
We connected TWO FirmTek dLite USB 3.0 bus-powered enclosures (each with 1TB Samsung 840 EVO) to the two USB 3.0 ports of the 2013 MacBook Pro Retina. After striping them (RAID 0), we measured 795MB/s READ, 764MB/s WRITE (AJA System 16GB sequential test). That's faster than the dual SSD bus-powered Thunderbolt Akitio Palm RAID that tested at 712MB/s READ, 527MB/s WRITE.
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OK, so two separate USB 3 controllers and SSDs RAIDed are faster than one Thunderbolt controller with two SSDs? A rather ambiguous comparison it seems.
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Seagate used to sell one. The Thunderbolt base is detachable.
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Filliam H. Muffman wrote:
I think it's only something to worry about if you are regularly getting impatient while transferring 100 GB to 400 GB of 4k video from your Red One. You can get triple the speed comparing two or more drives in RAID 0 in a Thundercrap enclosure to a single drive in USB 3. A single drive is usually plenty fast for over 90% of users.
ROUNDUP: USB 3.0 Bus-Powered Single Drive Storage Devices

I think the takeaway from this (and lots of other) benchmarking tests is that not all USB3 enclosures are equal. A high-end, high-speed USB3 case ain't cheap (though cheaper still than TB).